Mrs. Johnson was the mother of a newborn at Seattle Grace Hospital.
After her baby was born at Seattle Grace Hospital, the peds doctors diagnosed a murmur which they believed was benign but when Meredith thought differently, she told the baby's parents. As a result, Dr. Kerr allowed Burke to take the baby on as his patient and get an echo. After the echo, it was revealed that the baby had a birth defect and needed heart surgery. Burke then booked the OR for the following day.
She is married to Mr. Johnson and they have one child.